Arthur is an excellent worker with his hands (7)
I believe the answer is:
artisan
'excellent worker with his hands' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'arthur is an' is the wordplay.
'arthur' becomes 'art' (I've seen this in other clues).
'art'+'is'+'an'='ARTISAN'
Can you help me to learn more?
(Other definitions for artisan that I've seen before include "craftsman of his trade" , "Skilled manual 17" , "Skilled worker or craftsman" , "Handy worker" , "Skilled workman" .)